What are invisible components?.
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Why do we need hashmap in java?
When do we use hashset over treeset?
Why singleton class is used in java?
What is difference between java and java ee?
What is slash r?
What are the five major types of reference sources?
Can we print null in java?
How many types of gc are there in java?
Is Java is 100% pure OOPS? Explain?
Can we call the Thread.sleep in Synchyronozed block?
Can extern variables be initialized?
What access modifiers can be used for variables?